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Full Discussion: How to run simple single command on multiple Linux servers?
Top Forums Shell Programming and Scripting How to run simple single command on multiple Linux servers? Post 303006475 by Don Cragun on Thursday 2nd of November 2017 01:27:08 PM
Old 11-02-2017
I'm not at all sure that I understand what you're trying to do, but note that the each of the background subshells started by:
Code:
    (
    printf "%-29s " "$userhost"
    ssh -nx -o BatchMode=yes "$userhost" 'lsb_release -sd'
    ) </dev/null >"$tmpdir/$userhost" 2>&1 &

writes to a different file for each host. If you want all of the output in a single file and you want to trim off the first part of the lsb_release output you need something more like:
Code:
    (
    release=$(ssh -nx -o BatchMode=yes "$userhost" 'lsb_release -sd')
    printf "%-29s %s\n" "$userhost" "Rel${release##*Rel}"
    ) </dev/null >>"$tmpdir/alluserhosts" 2>&1 &

clearing the output file before you start your loop with:
Code:
>"$tmpdir/alluserhosts"

unless you want the output in that file to grow each time you invoke your script.

Since I don't have access to a system with lsb_release installed, the above is totally untested. But, in theory, it should come close to what you seem to want.
 

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LEARN ABOUT POSIX

lsb_release

lsb_release(1)						      General Commands Manual						    lsb_release(1)

NAME

       lsb_release - print distribution-specific information

SYNOPSIS

       lsb_release [options]

DESCRIPTION

       The lsb_release command provides certain LSB (Linux Standard Base) and distribution-specific information.

       If no options are given, the -v option is assumed.

OPTIONS

       The  program  follows  the  usual  GNU  command	line  syntax, with long options starting with two dashes (`--').  A summary of options are
       included below.

       -v, --version
	      Show the version of the LSB against which your current installation is compliant.  The version is expressed  as  a  colon  separated
	      list of LSB module descriptions.

       -i, --id
	      Display the distributor's ID.

       -d, --description
	      Display a description of the currently installed distribution.

       -r, --release
	      Display the release number of the currently installed distribution.

       -c, --codename
	      Display the code name of the currently installed distribution.

       -a, --all
	      Display all of the above information.

       -s, --short
	      Use the short output format for any information displayed.  This format omits the leading header(s).

       -h, --help
	      Show summary of options.

NOTES

       This  is a reimplementation of the lsb_release command provided by the Free Standards Group.  Any bugs are solely the responsibility of the
       author below.

       Detection of systems using a mix of packages from various distributions or releases is something of a  black  art;  the	current  heuristic
       tends  to  assume  that	the installation is of the earliest distribution which is still being used by apt but that heuristic is subject to
       error.

SEE ALSO

       lsb(8)

AUTHOR

       Chris Lawrence <lawrencc@debian.org>.

																    lsb_release(1)
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